期刊
JOURNAL OF APPLIED PHYCOLOGY
卷 25, 期 4, 页码 1031-1038出版社
SPRINGER
DOI: 10.1007/s10811-012-9936-8
关键词
Alkaline phosphatase; Nostoc flagelliforme; pH; Temperature; UVR
资金
- Foundation for Distinguished Young Talents in Higher Education of Guangdong, China [LYM09078]
- Doctoral Start-up Research Fund of Guangdong Natural Science Foundation, China [10451503101006265]
- Special Funds of Guangdong Universities and Colleges Talents Introduction
Cyanobacteria produce phosphatases in response to phosphorus deficiency as some other autotrophs. However, little has been documented on the effects of key climate change factors, such as temperature rise and solar UV radiation (280-400 nm), on cyanobacterial alkaline phosphatase activity. Here, we found that the terrestrial cyanobacterium Nostoc flagelliforme showed higher activity of the enzyme with increasing temperature and pH levels, exhibiting maximal values at 45 A degrees C and pH 11, respectively. However, when exposed to solar radiation in the presence of UV-A (320-400 nm) and UV-B (280-320 nm), significant reduction of the enzyme activity was observed at a photosynthetically active radiation (PAR) level of 300 W m(-2) (1,450 mu mol photons m(-2) s(-1)), which is equivalent or lower than the noontime level of solar PAR at the organism's habitats. UV-A and UV-A + UV-B induced about 21 and 39 % inhibition of the enzyme activity in the 3-h exposures. The decrease in the activity of phosphatase can be attributed to the UV radiation-induced inactivation of the enzyme and indirectly to the UV radiation-induced production of reactive oxygen species.
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